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Contains:  Owl nebula, M 97, NGC 3587
Getting plate-solving status, please wait...
M 97 Owl Nebula, 


            Michael Timm
M 97 Owl Nebula

M 97 Owl Nebula

Technical card

Resolution: 6560x4231

Dates:March 29, 2019

Frames: 137x120" (gain: 120.00) -20C bin 1x1

Integration: 4.6 hours

Darks: ~173

Flats: ~50

Flat darks: ~50

Avg. Moon age: 23.33 days

Avg. Moon phase: 37.51%

Bortle Dark-Sky Scale: 4.00

Temperature: 7.00 job: 2621861

RA center: 168.701 degrees

DEC center: 55.018 degrees

Pixel scale: 0.299 arcsec/pixel

Orientation: 272.674 degrees

Field radius: 0.324 degrees

Locations: Backyard, Vechelde, Niedersachsen, Germany

Data source: Backyard


A lot went wrong this evening. Autoguiding was terrible until i performed the meridian flip. After the flip guiding was very smooth. The next day i tried to track down the problem but was not very successful. It seems that the scope was not well balanced - or there is some sort of mechanical problem in the northeast?

Whatever, another problem occured: Something is terrible wrong with my flats. They inject a lot of noise into the image (remember the 'annoying-noise-blob' i tried to track down in february?). The reason for this noise is unknown to me, but it is clear that the flats are the source. Maybe i will upload an image of a noised flat later.
[Edit]: I uploaded an image called "The 'annoying-noise-blob', so if you want to see it in it's full splendor just take a look :-)

Nevertheless the image is much better than my first owl nebula a year ago - no wonder, the ASI294 Pro is superior to the uncooled ASI178MC i used back than. And i had to stop imaging after an hour or so due to an incoming flu i got last year. So all in all i improved my M 97 in my personal collection. Maybe i'll be back next year, hoping that i know how to take flats properly :-)

[Edit] I reprocessed the image with my new darks (taken in a refrigerator), without bias and with flats from february. Seems to be better, i think.



Michael Timm
License: None (All rights reserved)


  • M 97 Owl Nebula, 


            Michael Timm
  • Final
    M 97 Owl Nebula, 


            Michael Timm


Reprocessed with new darks, without bias and working flat.

Sky plot

Sky plot


M 97 Owl Nebula, 


            Michael Timm